Gas cell housing molding mold, method for manufacturing gas cell housing, gas cell housing for gas sensor, and gas sensor including same

Abstract

A gas sensor includes, in a single housing section, a substrate mounting surface 31 mounted with a substrate including a light emitter and a light receiver and a mirror section including plural reflectors. Then, in the housing section, all of the plural reflectors are integrally molded on an inner surface of the housing section to multiple reflect light emitted from the light emitter and cause the light to enter the light receiver in an opposing direction of one side and the other side in an extension direction of the substrate mounting surface.

The invention claimed is: 
     
       1. A gas cell housing molding mold for injection molding, with resin material, a gas cell housing comprising a mirror section including a plurality of reflectors arranged to multiple reflect light emitted from a light emitter and cause the light to enter a light receiver in an opposing direction of one side and an other side of a substrate mounting surface with respect to the substrate mounting surface mounted with a substrate including the light emitter and the light receiver,
 the gas cell housing molding mold being configured to integrally mold all of the plurality of reflectors on an inner surface of the single gas cell housing to be molded by setting mutual pull-out directions of a lower mold and an upper mold during mold release obliquely with respect to a direction perpendicular to an extension direction of the substrate mounting surface so that all of the plurality of reflectors have no undercut shape. 
 
     
     
       2. The gas cell housing molding mold according to  claim 1 , wherein the lower mold and the upper mold, respectively, have a protrusion portion, sliding contact surfaces of the mutual protrusion portions forming a shutoff surface, and the shutoff surface being parallel to the pull-out directions during mold release. 
     
     
       3. A method for manufacturing a gas cell housing, the method comprising using the gas cell housing molding mold according to  claim 1  to mold by setting the mutual pull-out directions of the lower and upper molds during mold release obliquely with respect to the direction perpendicular to the extension direction of the substrate mounting surface so that all of the plurality of reflectors have no undercuts and by inserting and pulling out the lower and upper molds and integrally mold all of the plurality of reflectors on an inner surface of the single housing section to manufacture the gas cell housing. 
     
     
       4. A gas cell housing for a gas sensor comprising, in a single housing section, a substrate mounting surface mounted with a substrate including a light emitter and a light receiver and a mirror section including a plurality of reflectors,
 wherein in the housing section, all of the plurality of reflectors are integrally molded on an inner surface of the housing section to multiple reflect light emitted from the light emitter and cause the light to enter the light receiver in an opposing direction of one side and an other side in an extension direction of the substrate mounting surface. 
 
     
     
       5. The gas cell housing for a gas sensor according to  claim 4 , wherein the housing section has an opening portion on a side having the substrate mounting surface and another opening portion on a side facing the side having the substrate mounting surface, the opening portion on the side having the substrate mounting surface being formed on the substrate mounting surface, and the opening portion on the side facing the side having the substrate mounting surface being used as an inlet/outlet for a gas to be measured. 
     
     
       6. A gas sensor comprising the gas cell housing for a gas sensor according to  claim 4 .